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Geomechanics and Engineering Volume 30, Number 2, July25 2022 , pages 123-138 DOI: https://doi.org/10.12989/gae.2022.30.2.123 |
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Seismic bearing capacity of shallow embedded strip footing on rock slopes |
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Shuvankar Das, Koushik Halder and Debarghya Chakraborty
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| Abstract | ||
| Present study computes the ultimate bearing capacity of an embedded strip footing situated on the rock slope subjected to seismic loading. Influences of embedment depth of strip footing, horizontal seismic acceleration coefficient, rock slope angle, Geological Strength Index, normalized uniaxial compressive strength of rock mass, disturbance factor, and Hoek-Brown material constant are studied in detail. To perform the analysis, the lower bound finite element limit analysis method in combination with the semidefinite programming is utilized. From the results of the present study, it can be found that the magnitude of the bearing capacity factor reduces quite substantially with an increment in the seismic loading. In addition, with the increment in slope angle, further reduction in the value of the bearing capacity factor is observed. On the other hand, with an increment in the embedment depth, an increment in the value of the bearing capacity factor is found. Stress contours are presented to describe the combined failure mechanism of the footing-rock slope system in the presence of static as well as seismic loadings for the different embedment depths. | ||
| Key Words | ||
| embedded footing; lower bound limit analysis; rock slope; seismic bearing capacity; semidefinite programming | ||
| Address | ||
| Shuvankar Das, Koushik Halder and Debarghya Chakraborty: Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur-721302, India | ||